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linux/drivers/misc/mei/hdcp/mei_hdcp.h
Gustavo A. R. Silva c56967d674 mei: hdcp: Replace one-element array with flexible-array member 
There is a regular need in the kernel to provide a way to declare
having a dynamically sized set of trailing elements in a structure.
Kernel code should always use “flexible array members”[1] for these
cases. The older style of one-element or zero-length arrays should
no longer be used[2].

Also, make use of the array_size() helper instead of the open-coded
version in memcpy(). These sorts of multiplication factors need to
be wrapped in array_size().

And while there, use the preferred form for passing a size of a struct.
The alternative form where struct name is spelled out hurts readability
and introduces an opportunity for a bug when the pointer variable type is
changed but the corresponding sizeof that is passed as argument is not.

[1] https://en.wikipedia.org/wiki/Flexible_array_member
[2] https://github.com/KSPP/linux/issues/79

Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/20200722181534.GA31357@embeddedor
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-07-23 09:27:09 +02:00

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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright © 2019 Intel Corporation
*
* Authors:
* Ramalingam C <ramalingam.c@intel.com>
*/
#ifndef __MEI_HDCP_H__
#define __MEI_HDCP_H__
#include <drm/drm_hdcp.h>
/* me_hdcp_status: Enumeration of all HDCP Status Codes */
enum me_hdcp_status {
ME_HDCP_STATUS_SUCCESS = 0x0000,
/* WiDi Generic Status Codes */
ME_HDCP_STATUS_INTERNAL_ERROR = 0x1000,
ME_HDCP_STATUS_UNKNOWN_ERROR = 0x1001,
ME_HDCP_STATUS_INCORRECT_API_VERSION = 0x1002,
ME_HDCP_STATUS_INVALID_FUNCTION = 0x1003,
ME_HDCP_STATUS_INVALID_BUFFER_LENGTH = 0x1004,
ME_HDCP_STATUS_INVALID_PARAMS = 0x1005,
ME_HDCP_STATUS_AUTHENTICATION_FAILED = 0x1006,
/* WiDi Status Codes */
ME_HDCP_INVALID_SESSION_STATE = 0x6000,
ME_HDCP_SRM_FRAGMENT_UNEXPECTED = 0x6001,
ME_HDCP_SRM_INVALID_LENGTH = 0x6002,
ME_HDCP_SRM_FRAGMENT_OFFSET_INVALID = 0x6003,
ME_HDCP_SRM_VERIFICATION_FAILED = 0x6004,
ME_HDCP_SRM_VERSION_TOO_OLD = 0x6005,
ME_HDCP_RX_CERT_VERIFICATION_FAILED = 0x6006,
ME_HDCP_RX_REVOKED = 0x6007,
ME_HDCP_H_VERIFICATION_FAILED = 0x6008,
ME_HDCP_REPEATER_CHECK_UNEXPECTED = 0x6009,
ME_HDCP_TOPOLOGY_MAX_EXCEEDED = 0x600A,
ME_HDCP_V_VERIFICATION_FAILED = 0x600B,
ME_HDCP_L_VERIFICATION_FAILED = 0x600C,
ME_HDCP_STREAM_KEY_ALLOC_FAILED = 0x600D,
ME_HDCP_BASE_KEY_RESET_FAILED = 0x600E,
ME_HDCP_NONCE_GENERATION_FAILED = 0x600F,
ME_HDCP_STATUS_INVALID_E_KEY_STATE = 0x6010,
ME_HDCP_STATUS_INVALID_CS_ICV = 0x6011,
ME_HDCP_STATUS_INVALID_KB_KEY_STATE = 0x6012,
ME_HDCP_STATUS_INVALID_PAVP_MODE_ICV = 0x6013,
ME_HDCP_STATUS_INVALID_PAVP_MODE = 0x6014,
ME_HDCP_STATUS_LC_MAX_ATTEMPTS = 0x6015,
/* New status for HDCP 2.1 */
ME_HDCP_STATUS_MISMATCH_IN_M = 0x6016,
/* New status code for HDCP 2.2 Rx */
ME_HDCP_STATUS_RX_PROV_NOT_ALLOWED = 0x6017,
ME_HDCP_STATUS_RX_PROV_WRONG_SUBJECT = 0x6018,
ME_HDCP_RX_NEEDS_PROVISIONING = 0x6019,
ME_HDCP_BKSV_ICV_AUTH_FAILED = 0x6020,
ME_HDCP_STATUS_INVALID_STREAM_ID = 0x6021,
ME_HDCP_STATUS_CHAIN_NOT_INITIALIZED = 0x6022,
ME_HDCP_FAIL_NOT_EXPECTED = 0x6023,
ME_HDCP_FAIL_HDCP_OFF = 0x6024,
ME_HDCP_FAIL_INVALID_PAVP_MEMORY_MODE = 0x6025,
ME_HDCP_FAIL_AES_ECB_FAILURE = 0x6026,
ME_HDCP_FEATURE_NOT_SUPPORTED = 0x6027,
ME_HDCP_DMA_READ_ERROR = 0x6028,
ME_HDCP_DMA_WRITE_ERROR = 0x6029,
ME_HDCP_FAIL_INVALID_PACKET_SIZE = 0x6030,
ME_HDCP_H264_PARSING_ERROR = 0x6031,
ME_HDCP_HDCP2_ERRATA_VIDEO_VIOLATION = 0x6032,
ME_HDCP_HDCP2_ERRATA_AUDIO_VIOLATION = 0x6033,
ME_HDCP_TX_ACTIVE_ERROR = 0x6034,
ME_HDCP_MODE_CHANGE_ERROR = 0x6035,
ME_HDCP_STREAM_TYPE_ERROR = 0x6036,
ME_HDCP_STREAM_MANAGE_NOT_POSSIBLE = 0x6037,
ME_HDCP_STATUS_PORT_INVALID_COMMAND = 0x6038,
ME_HDCP_STATUS_UNSUPPORTED_PROTOCOL = 0x6039,
ME_HDCP_STATUS_INVALID_PORT_INDEX = 0x603a,
ME_HDCP_STATUS_TX_AUTH_NEEDED = 0x603b,
ME_HDCP_STATUS_NOT_INTEGRATED_PORT = 0x603c,
ME_HDCP_STATUS_SESSION_MAX_REACHED = 0x603d,
/* hdcp capable bit is not set in rx_caps(error is unique to DP) */
ME_HDCP_STATUS_NOT_HDCP_CAPABLE = 0x6041,
ME_HDCP_STATUS_INVALID_STREAM_COUNT = 0x6042,
};
#define HDCP_API_VERSION 0x00010000
#define HDCP_M_LEN 16
#define HDCP_KH_LEN 16
/* Payload Buffer size(Excluding Header) for CMDs and corresponding response */
/* Wired_Tx_AKE */
#define WIRED_CMD_BUF_LEN_INITIATE_HDCP2_SESSION_IN (4 + 1)
#define WIRED_CMD_BUF_LEN_INITIATE_HDCP2_SESSION_OUT (4 + 8 + 3)
#define WIRED_CMD_BUF_LEN_VERIFY_RECEIVER_CERT_IN (4 + 522 + 8 + 3)
#define WIRED_CMD_BUF_LEN_VERIFY_RECEIVER_CERT_MIN_OUT (4 + 1 + 3 + 16 + 16)
#define WIRED_CMD_BUF_LEN_VERIFY_RECEIVER_CERT_MAX_OUT (4 + 1 + 3 + 128)
#define WIRED_CMD_BUF_LEN_AKE_SEND_HPRIME_IN (4 + 32)
#define WIRED_CMD_BUF_LEN_AKE_SEND_HPRIME_OUT (4)
#define WIRED_CMD_BUF_LEN_SEND_PAIRING_INFO_IN (4 + 16)
#define WIRED_CMD_BUF_LEN_SEND_PAIRING_INFO_OUT (4)
#define WIRED_CMD_BUF_LEN_CLOSE_SESSION_IN (4)
#define WIRED_CMD_BUF_LEN_CLOSE_SESSION_OUT (4)
/* Wired_Tx_LC */
#define WIRED_CMD_BUF_LEN_INIT_LOCALITY_CHECK_IN (4)
#define WIRED_CMD_BUF_LEN_INIT_LOCALITY_CHECK_OUT (4 + 8)
#define WIRED_CMD_BUF_LEN_VALIDATE_LOCALITY_IN (4 + 32)
#define WIRED_CMD_BUF_LEN_VALIDATE_LOCALITY_OUT (4)
/* Wired_Tx_SKE */
#define WIRED_CMD_BUF_LEN_GET_SESSION_KEY_IN (4)
#define WIRED_CMD_BUF_LEN_GET_SESSION_KEY_OUT (4 + 16 + 8)
/* Wired_Tx_SKE */
#define WIRED_CMD_BUF_LEN_ENABLE_AUTH_IN (4 + 1)
#define WIRED_CMD_BUF_LEN_ENABLE_AUTH_OUT (4)
/* Wired_Tx_Repeater */
#define WIRED_CMD_BUF_LEN_VERIFY_REPEATER_IN (4 + 2 + 3 + 16 + 155)
#define WIRED_CMD_BUF_LEN_VERIFY_REPEATER_OUT (4 + 1 + 16)
#define WIRED_CMD_BUF_LEN_REPEATER_AUTH_STREAM_REQ_MIN_IN (4 + 3 + \
32 + 2 + 2)
#define WIRED_CMD_BUF_LEN_REPEATER_AUTH_STREAM_REQ_OUT (4)
/* hdcp_command_id: Enumeration of all WIRED HDCP Command IDs */
enum hdcp_command_id {
_WIDI_COMMAND_BASE = 0x00030000,
WIDI_INITIATE_HDCP2_SESSION = _WIDI_COMMAND_BASE,
HDCP_GET_SRM_STATUS,
HDCP_SEND_SRM_FRAGMENT,
/* The wired HDCP Tx commands */
_WIRED_COMMAND_BASE = 0x00031000,
WIRED_INITIATE_HDCP2_SESSION = _WIRED_COMMAND_BASE,
WIRED_VERIFY_RECEIVER_CERT,
WIRED_AKE_SEND_HPRIME,
WIRED_AKE_SEND_PAIRING_INFO,
WIRED_INIT_LOCALITY_CHECK,
WIRED_VALIDATE_LOCALITY,
WIRED_GET_SESSION_KEY,
WIRED_ENABLE_AUTH,
WIRED_VERIFY_REPEATER,
WIRED_REPEATER_AUTH_STREAM_REQ,
WIRED_CLOSE_SESSION,
_WIRED_COMMANDS_COUNT,
};
union encrypted_buff {
u8 e_kpub_km[HDCP_2_2_E_KPUB_KM_LEN];
u8 e_kh_km_m[HDCP_2_2_E_KH_KM_M_LEN];
struct {
u8 e_kh_km[HDCP_KH_LEN];
u8 m[HDCP_M_LEN];
} __packed;
};
/* HDCP HECI message header. All header values are little endian. */
struct hdcp_cmd_header {
u32 api_version;
u32 command_id;
enum me_hdcp_status status;
/* Length of the HECI message (excluding the header) */
u32 buffer_len;
} __packed;
/* Empty command request or response. No data follows the header. */
struct hdcp_cmd_no_data {
struct hdcp_cmd_header header;
} __packed;
/* Uniquely identifies the hdcp port being addressed for a given command. */
struct hdcp_port_id {
u8 integrated_port_type;
/* physical_port is used until Gen11.5. Must be zero for Gen11.5+ */
u8 physical_port;
/* attached_transcoder is for Gen11.5+. Set to zero for <Gen11.5 */
u8 attached_transcoder;
u8 reserved;
} __packed;
/*
* Data structures for integrated wired HDCP2 Tx in
* support of the AKE protocol
*/
/* HECI struct for integrated wired HDCP Tx session initiation. */
struct wired_cmd_initiate_hdcp2_session_in {
struct hdcp_cmd_header header;
struct hdcp_port_id port;
u8 protocol; /* for HDMI vs DP */
} __packed;
struct wired_cmd_initiate_hdcp2_session_out {
struct hdcp_cmd_header header;
struct hdcp_port_id port;
u8 r_tx[HDCP_2_2_RTX_LEN];
struct hdcp2_tx_caps tx_caps;
} __packed;
/* HECI struct for ending an integrated wired HDCP Tx session. */
struct wired_cmd_close_session_in {
struct hdcp_cmd_header header;
struct hdcp_port_id port;
} __packed;
struct wired_cmd_close_session_out {
struct hdcp_cmd_header header;
struct hdcp_port_id port;
} __packed;
/* HECI struct for integrated wired HDCP Tx Rx Cert verification. */
struct wired_cmd_verify_receiver_cert_in {
struct hdcp_cmd_header header;
struct hdcp_port_id port;
struct hdcp2_cert_rx cert_rx;
u8 r_rx[HDCP_2_2_RRX_LEN];
u8 rx_caps[HDCP_2_2_RXCAPS_LEN];
} __packed;
struct wired_cmd_verify_receiver_cert_out {
struct hdcp_cmd_header header;
struct hdcp_port_id port;
u8 km_stored;
u8 reserved[3];
union encrypted_buff ekm_buff;
} __packed;
/* HECI struct for verification of Rx's Hprime in a HDCP Tx session */
struct wired_cmd_ake_send_hprime_in {
struct hdcp_cmd_header header;
struct hdcp_port_id port;
u8 h_prime[HDCP_2_2_H_PRIME_LEN];
} __packed;
struct wired_cmd_ake_send_hprime_out {
struct hdcp_cmd_header header;
struct hdcp_port_id port;
} __packed;
/*
* HECI struct for sending in AKE pairing data generated by the Rx in an
* integrated wired HDCP Tx session.
*/
struct wired_cmd_ake_send_pairing_info_in {
struct hdcp_cmd_header header;
struct hdcp_port_id port;
u8 e_kh_km[HDCP_2_2_E_KH_KM_LEN];
} __packed;
struct wired_cmd_ake_send_pairing_info_out {
struct hdcp_cmd_header header;
struct hdcp_port_id port;
} __packed;
/* Data structures for integrated wired HDCP2 Tx in support of the LC protocol*/
/*
* HECI struct for initiating locality check with an
* integrated wired HDCP Tx session.
*/
struct wired_cmd_init_locality_check_in {
struct hdcp_cmd_header header;
struct hdcp_port_id port;
} __packed;
struct wired_cmd_init_locality_check_out {
struct hdcp_cmd_header header;
struct hdcp_port_id port;
u8 r_n[HDCP_2_2_RN_LEN];
} __packed;
/*
* HECI struct for validating an Rx's LPrime value in an
* integrated wired HDCP Tx session.
*/
struct wired_cmd_validate_locality_in {
struct hdcp_cmd_header header;
struct hdcp_port_id port;
u8 l_prime[HDCP_2_2_L_PRIME_LEN];
} __packed;
struct wired_cmd_validate_locality_out {
struct hdcp_cmd_header header;
struct hdcp_port_id port;
} __packed;
/*
* Data structures for integrated wired HDCP2 Tx in support of the
* SKE protocol
*/
/* HECI struct for creating session key */
struct wired_cmd_get_session_key_in {
struct hdcp_cmd_header header;
struct hdcp_port_id port;
} __packed;
struct wired_cmd_get_session_key_out {
struct hdcp_cmd_header header;
struct hdcp_port_id port;
u8 e_dkey_ks[HDCP_2_2_E_DKEY_KS_LEN];
u8 r_iv[HDCP_2_2_RIV_LEN];
} __packed;
/* HECI struct for the Tx enable authentication command */
struct wired_cmd_enable_auth_in {
struct hdcp_cmd_header header;
struct hdcp_port_id port;
u8 stream_type;
} __packed;
struct wired_cmd_enable_auth_out {
struct hdcp_cmd_header header;
struct hdcp_port_id port;
} __packed;
/*
* Data structures for integrated wired HDCP2 Tx in support of
* the repeater protocols
*/
/*
* HECI struct for verifying the downstream repeater's HDCP topology in an
* integrated wired HDCP Tx session.
*/
struct wired_cmd_verify_repeater_in {
struct hdcp_cmd_header header;
struct hdcp_port_id port;
u8 rx_info[HDCP_2_2_RXINFO_LEN];
u8 seq_num_v[HDCP_2_2_SEQ_NUM_LEN];
u8 v_prime[HDCP_2_2_V_PRIME_HALF_LEN];
u8 receiver_ids[HDCP_2_2_RECEIVER_IDS_MAX_LEN];
} __packed;
struct wired_cmd_verify_repeater_out {
struct hdcp_cmd_header header;
struct hdcp_port_id port;
u8 content_type_supported;
u8 v[HDCP_2_2_V_PRIME_HALF_LEN];
} __packed;
/*
* HECI struct in support of stream management in an
* integrated wired HDCP Tx session.
*/
struct wired_cmd_repeater_auth_stream_req_in {
struct hdcp_cmd_header header;
struct hdcp_port_id port;
u8 seq_num_m[HDCP_2_2_SEQ_NUM_LEN];
u8 m_prime[HDCP_2_2_MPRIME_LEN];
__be16 k;
struct hdcp2_streamid_type streams[];
} __packed;
struct wired_cmd_repeater_auth_stream_req_out {
struct hdcp_cmd_header header;
struct hdcp_port_id port;
} __packed;
#endif /* __MEI_HDCP_H__ */
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